Racepak Download

[Don Eckel 111]

Originally Posted by SST159

Greg,
Thanks for the video.
This info can be very helpful for many.
I do have a question which is:
You suggest to mark the beginning of the run when you come off the two step.
I have been setting it at the first move of the drive shaft.
My thought is that is the first movement of the car which is braking the beam on the track time.

I agree that setting the zero when you come off the 2 step may be off a bit. That is where the motor begins to accelerate, and, although small, there is definitely a lag before the car moves. I also don't set mine by the driveshaft because the position of the first magnet to cross the pickup can be almost 180 degrees away. When you figure in ratios and such, that can be substantial. I like to look at the g-meter and set my zero time to the point where it begins to rise. My reason for this is that until that begins to climb, the car can't be moving. I'm interested to hear others' thoughts!